Light source device, optical scanner, display system, and mobile object

Abstract

A light source device includes a plurality of light sources configured to output a plurality of laser beams of different color components; and circuitry. A ratio in maximum output power between the plurality of laser beams output from the plurality of light sources is variable.

The invention claimed is: 
     
       1. An optical scanner, comprising:
 a plurality of light sources configured to output a plurality of laser beams of different color components, a ratio in maximum output power between the plurality of laser beams output from the plurality of light sources being variable; 
 an output power detector configured to detect output power of a bundle of the plurality of laser beams; and 
 a light deflector configured to deflect light emitted from the plurality of light sources to scan in a first scanning direction and a second scanning direction, the second scanning direction being orthogonal to the first scanning direction, 
 wherein the output power of the bundle of the plurality of laser beams is variable based on a detection result of the output power detector. 
 
     
     
       2. The optical scanner according to  claim 1 , further comprising a temperature detector configured to detect a temperature,
 wherein the ratio in maximum output power between the plurality of laser beams output from the plurality of light sources is variable based on a detection result of the temperature detector. 
 
     
     
       3. The optical scanner according to  claim 2 ,
 wherein a ratio in output power between the plurality of laser beams output from the plurality of light sources is variable based on the detection result of the temperature detector. 
 
     
     
       4. The optical scanner according to  claim 1 ,
 wherein the plurality of laser beams includes a laser beam of a red component, a laser beam of a green component, and a laser beam of a blue component, and 
 wherein a ratio in output power between the plurality of laser beams is variable so as to maintain white balance constant. 
 
     
     
       5. The optical scanner according to  claim 1 , wherein the ratio in maximum output power between the plurality of laser beams output from the plurality of light sources changes according to a control signal output from processing circuitry,
 wherein the processing circuitry determines the ratio in maximum output power so as to maintain white balance constant. 
 
     
     
       6. The optical scanner according to  claim 1 , further comprising processing circuitry configured to control the plurality of light sources to emit light based on image data and control the light deflector to form an image with the light based on the image data within an image area of a scanning range to be irradiated with the light which has been scanned,
 wherein the processing circuitry is configured to control the output power of the plurality of laser beams so as to change the ratio in maximum output power between the plurality of laser beams. 
 
     
     
       7. The optical scanner according to  claim 6 , further comprising a screen to be scanned with the scanning light by the light deflector,
 wherein the image area on which the image is formed is on the screen. 
 
     
     
       8. A display system comprising:
 the optical scanner according to  claim 1 ; 
 an image forming optical system; and 
 a reflector, 
 the image forming optical system configured to reflect the light projected from a screen toward the reflector, and 
 the reflector configured to reflect the light reflected by the image forming optical system so as to form a virtual image. 
 
     
     
       9. A mobile object comprising the display system according to  claim 8 ,
 wherein the reflector is a windshield.